Gun barrel mounting



A118- 10 1943 s. G. GREEN 2,326,139

GUN BARREL MOUNTING Filed. July 8', 1940 F' E 35 l 11732 /A #lbf/[11444111141117114171 A Y Fig- 4. 4G

ATTORNEY vand ' .-ber. 'Y 'rIt acturedand usedby Qrffor the Government for,

me ofl any royalty thereon, 1 ,This invention' relates to a governmental purposes, Without Athe pax'frnentftoy Y 1- 1 he muzzleend ofthe barrel is provided with 'a `r 553 ledNoVeinber 2, 179'39,.`v i 'It is anobject of the present invention vto so m unmngrmrnmov 'inggun barrels,-especia11y-wh Y C011 @heck-end I accelerator, and constitutes'ari irnp rox/ ementuijqnl ny U. S. (zo-pending 'applicatoriSeri'aLNm '302,5 e

1. thereafter 7 ltwe'enzthehbearingr surfacesireferredfto break or bebroken awaypy thefbroachingaction Acorcian'cev with thealcove rstateclA objects and. affidi# als; tumour-withstand gj attacks Awhen 2oz -o'f 'lheco-plen'i'ng applicatiorpon which carbonf" f' or vother residue tende to collect,y in a; 'manner tof; positively eliminate fouling ycfa Chfacter'that 1 i will impede free recoil 'o fjtlie rfnovingj barrel(` 1j A still'further objectof ftheiinventicn-isfto prol'Vide a structure characterized to function intac- 1 cited'problemsgandfgiicul eel f as ether bbjeti -andj .dvantageslclearly V appear from-a description .f o l Y. embodiment; as -f shew-n 'H f u the f e 'ed in and removed'froni* Water cooled gunwi'tlrout damage to the barrelpacking. With the inereasedsp'eed or 'cyclic rateof automatic VWeapons demanded' to-day, and the in j tricate installations lwhicharefonly'racceseilcle with consderabledifficulty, sli/chas' in themedinoun'ting that tends tlorcauseejbi reduces the 'free recoil 'of 'thebarreijand thus the fcient to rely on cleaningthes due tothe relative inaccessibii Vern airplane, itfiias becomefes'sentiai that" speed n :or rate acceleratorsbe employe"d and 'that'to achieve the full advantagevof emp loying' tie eX- "pedient .the"bai1"e1 mounting Witiiiff the".aecelf-Y V`erator be sof designed, inthe; caeeof recoiling bar-` Vrelsjtlcat the formation of fouling ihcdentt'ofr? l Ving, of Vice when theplane iszlinfiight hdtheglll.'

ont of actie-n, or any? accumulationfonfthe barrel v dingwhichv ansi-the time'consuming nature-ofthe tasklt will be' appreciated that'wiierftiieclearancebef-q Eater, similar tothe: one-.disclosed in my finglapplication,to,tne Vmuzzle portioneo ak yingthe zing;

1f-'ig'.V 2,15 af yiewimiiglr. to', 15mg., 1

a asmade on aiiquid cooled gu and 5 are vleWs similar to F1 Y A recoilQcneck and:barrelfacceleratorgge YlinY the, sc pe' of anromperabie 1:0 the lattaclfied to thernuzzleendportion Fas fOlIQWSr"Vv 'having' @ferrara-riem@ f tliefgun.

drawstring iniwhiclfizw f.:

idn'gitudmm @tional-l? view showing`the'application o f arbarre acelH cooled gunand thefiinproved; means ,for-b ach klarrel bearingnsuriace.; subjected structure- 'of barrel; showing hqw;the xtrior muzzle-jpeg@ p' may be ,used asy aguidefin lieuof tlieguideisl Ves s hown inFigs. lto 5.3,; Y Y f' ,designated atA f affdesign contemplated .as 1

eratofiof my. V,ccnalidixic'app anon is;

' Ajgenerallyjcylindricai'barre "edueed".

indicated at AIt. and preferably formed of an aluy minum-bronze alloy of selflubricating characteristics, one composition of lwhich is known` to the art asfigreasybronze,is secured-to the bar-` rel IE! 'with its forward face disposed inV fluid Ysealed planar relation with VYthe'forward face of the barrel and its body portion circumferentially spaced from the barrelg'to maintain interchange of heat between the'sleeve'and barrel toa mini-l mum. l y

,To provide a bearingfor the barrel vguide sleeve l2, va tubular memberl'l formedof nonfcorrosive.. material is suitably secured to the forward porf shown at IS. As in thevco-pending application A referred to, the bearing sleeve l 2 is longitudinally grooved throughout its portion cooperating with V:bearing I9 at suitably spaced circumferential- Y alloy known in the'art as stellite has been found admirably adapted.V While ring 3G hasbeen dev ture of the latter Vsurfaces with the groove.

llongitudinally spaced cylindrical surfaces separated by a circumferential clearance groove presenting sharp breaching edges at theouter ter'-V inini ofthe cylindrical surfaces and at" the juncfcomplementary breachingy bearing ring 31 is s"eated"- Within a circumferential groove intermediate the ends of member |71 so'asgto circumscribe Vthe ring 3B in registering relation in the The ring 31 in battery position of the barrel. is retainedV in position within its groove through abutting engagement withthe rear endl of plug 26 and. hasl a bearing surface confronting the bearing surface of ringBS identical therewith. Ringr 3l, is also made of the same material and method f as ring 36 and its bearing surface clears thatof intervals'to reduce'drag effected bythe friction of grooves and reduced portion I6 .which facilitates machining` of .thefgrooves andfserves van'additialfunctionof impedingthe flow, of gases into f the,grooves` as will hereinafter morefully be made apparent.

The forward lend ipprtin orY the membe 1 .projects forwardly ofthe muzzle of the barrel and is interiorly threaded or otherwise Vformed to rec eivea plug 2 6 withitsrear face in'substantially planar Vregistration with' the forward'face of the barrel whenV thelatteris in .in battery position.

The plug 2B is axiallyboredat"21,to form apro# jectile passage in alignment with the bore .of the sofaccurate a't between the sleeve in itsbearing I9 to a min imum. .j 1n th'ecase of the .instant Y sleeve, howeverga` circumferential groove` lris Vformed intermediate the forward ends of. .the

barrel'. and is inwardly recessed on oppositer'end "facesformingV truncatedconical cavities=28and 29 ofsu'itable size to ,cooperate in Vproviding Vacceltively. Intemediate'its ends the plug 2B is 'pro- -vided with exteriorly Vdisposed arcuate anges 32 `havingflats 32' therebetween to Vreceive a1 tool whentobe vsecured within the end of member 1 1,-

and adapted to abut a gasket 32 interposed theremember' l1 as shown betweenand the end ofthe inFigs. land 1a.

Frwarqly of the flanges 3 2 the pmgisfmmeq exteriorly in any suitable manner to receive a gas `-check.nnernber 33 which is interiorlyormed to provide an axial cavity offorwardly decreasing cross sectional area terminating in a Acylindrical projectilepassage.v A deilectionxshield 34 and/or gasketma'y beinterposed betweven'the rear 'end' of thehgas check memberand forwardffaces of the arcuate flanges 32V oir-.plug "25. lThe cavity' Vwithin thegas check member `cooper ateswith the berend arrangement of ports. `The forward Vend portion 116 of sleeve l2Y is` formithe gas check chamber 3l whichjis in com- -imunication with atmosphere by a suitablelnum- Vring 35 several thousandths of fan inch positively eliminating undue .drag betweenthese surfaces Whichis maintained bythe'present` invention due to the breaching action of the hroaching surfaces, it being necessary to `employ a high grade tool Vsteel or its equivalent as usedin reamingtoolsfor such purpose dueto the hardness and tenacity of `the carbon deposits tending to formi r Ports A38 formed in member. l las shown permit egressfofgas from the acceleration` chamber 3f! thrcugh'the clearance of bearingrings 33 and3l. VIri Vtheoperation of the invention thus far described gases of explosion upon firing will collect in the'. ac celerati'on c ha'nlberV 3 0 Vexerting a' forwardly directed forcefupon the plug'Z, member l1', jacket] l Aand therethrough reduce the forces acting inrecoil, simultaneously with the action of reducing recoil thejgases actingiupon theV for- Wardfacesof sleeve I2 andbarrel il) will"suplplement the forces 'actingtol movegthe barrel in recoil Yand thereby boost the speedof` recoil thereofV or accelerate this phase ofV the cycle in operation. The gases collectingin chamber 35.3 will subsequently pass `into chamber` 3l and impart a'.v forward drive Vto the Wallsof the `gas check lmember?*which yis'transmitted. to jacket` l l and 38 'and is substantially precluded from coming" intocontact Withthe Ybearing-IS) bythe deflection Vshoulder formed bythe reducedportion I6 of the sleeve and groove ll5 in rear thereof. l.Due to the self-,lubricating characteristics o f the sleeve l2 the bearing I Sis'adequately lubricated.

VWith the, arrangement above described it has Vbeen found that necessity for disassembling the gun to Aremove carbon deposits and-other fouling from thefloearings by reaming as presently practiced in therart, or to otherwiseclean these parts preferably formed Vof* a material having a red hot hi purpose a tungstencobaltjchroinium 'hardness greaterY than that 'of the carbonaceous or residue deposit Vtending to collect in thiszone,

"and lubricate the'same'has been greatly reduced if not entirely eliminated.` v Y The action oftheV expanding gases and `recompression thereof'on the ignition and combustion .of Yresidue having, been previously described and being substantially the same as in the 'copend- A:ing case above referred to is notvherein repeated.

75 InA 2 therer is shown theapplication of r barrel vwith its body; portion 4spaced :from lthe relation, said' tubular member V:being-.1 formed to v "receive the said sleeve in accurately/fitted bear-.

c ing relation rearwardly of themuzzle'end there? ci, cooperating broaching :1ingsjsecured;to'the sleeve andi-tubular member forwardly or said bearing and havinga working'clearanceof one to f our tiines the clearance of the bearingmeans on thev tubular'` memberyforming an acceleration chamber adjacent the muzzle end of said sleeve and barrel, and'means in said tubular member establishing communication betweenthe atmosbarrel. radially and-its forwardV portion in iuid Y sealedrelation with .the muzzleend ofthe barrel,gsaid front end cap bearingreceiving the body.

portion: of the sleevein-accurately fitted bearing Vrelation, a-tubular member secured to said Afront i c, end cap inV axial prolongation of the barrel and phere and accelerating chamber upon the recoil of the barrel and.intermediatesaid,bearingand y Y broaching rings. l l z C.

` 3. In a weapon comprising, ajrecoiling barrel,f a barrel jacket surroundingthe barrel, .a tubular I member secured to the jacket ini axial prolongation thereQfnfa `bearing Lsleeve provided Awith ,a f, cylindrical bodyportion terminatinglinga for-V,

ward portionof` reduced section lsecured to the muzzleendportion o f tliebarrel with 4its body portion fspracedfrom thefbarrel radially and its Y forward portionin uidefsealcdrelation with thel muzzieend of the barreLisaidftubularmember be- :ing formed toreceiveV the bodyportion oigsaid sleeve in laccurately ntted bearing relation, a broaching ring Vorfsmaller diameter than said bodyportion, securedtc the portionfof said sleeve of reducedsection, a cooperating breaching ring secured to` said tubularfmembenthe; Vclearance `formed to receive the body portion of saidsleeve in accurately tted-bearing relation 'forwardly .ofv said iirst named bearing, Vpacking material interposed" between said bearings in liquid sealed engagement with `the 4body ofV saidmsleeve, -a breaching ringyofsmaller outside diameter than Y lthe corresponding'diameter of said body portion of the sleeveV secured Vto the forward portion of n Yreduced 'section thereof, a cooperating breaching ring Ysecured toA saidl tubularmember, the clearance between saidfbroaching rings being` one to four Vtimes the clearance of saidbearings, means on ,the Vtubular member forming an .acceleration chamber adjacentthe muzzlerend of said sleeve Vand barrel, and means inY said tubular member establishing communicatiombetwee'n.the atmosbetween saidbroachingrings being-lone to four timesthe Vclearance of saidbearing,` means on the `tubular Vmemberl forming; an"acceleratio`n chamberpadjacent'the muzzleend of said sleeve f and barrel, and means insaid tubular member` establishing(communication between the atmosphere and accelerating chamber -uponV theV recoil,

' of the barrel andintermediate lsaid bearing/andi;Y

brcachingrings;

4. In aV weapon comprising arecdilingfbarrel,

arbarrel jacket surrounding thefbarrel, a tubular packing memberg 4- phere and accelerating chamber uponY the `recoil "ofthe-barrel and intermediate'said bearings and broaching rings whereby said barreL'sleve and ,c 'broachingl ring attached to the sleeve maybe V ,removed from theV gun as a unit4 without damage to said packing;

SQThe structureof Aclaiml B Wherein Said front endcapgis interiorly grooved circumferentially forwardly of the bearing therein `to receive said packing. l

V7, The'structurezof .claim 5 wherein said front Vend, capis interiorly grooved circumferentially forwardly of the bearing therein to receive` said andi thel Vrear A.portion ofsaid tubular 8.7In a weapon comprising Va `recoiling barrel, a barreljacket surroundingthe barrel, a tubular vmembersecured to' the jacket in, axial prolongamemberfsecured-to the jacket in Vaxial prolongation thereof, abearing .sleeve provided with, a

cylindrical body portion terminating infa forwardv portion of reduced section secured to the muzzle end portion of the" barrel with itslbodyV portion spacedrfrom theA barrel radiallylandits forward i portion lin fluid sealed relation with theimuzzle end of theY barrelpsaid tubular memberybeingV f formedto receive the body portion of said sleeve in accurately tted bearing re1ation',"a breaching ringl of smaller diameter than. said body portion secured to the portion of said sleeve ofireduced section, a cooperating-broaching ring secured to said tubular memben'the clearancelbetweenf said breaching-,rings being one togfour times the membervrforming an acceleration chamber ad- `tion thereof,Y a bearing sleevesecured to the muz- :z'leend porti'on'of the rbarrel in uid sealed relation, said tubular .member being formed'to receive the, sleeve in accuratelytted bearing relation Y-rearwardly ofthe muzzle fend: thereof, complementary breaching rings secured to the bear'- 'ing'sleeve adjacent its muzzle end and the tubular member disposed to bein registering relation in the-in batteryV position of the barrel, said Y vbroacliingrings having aw'orking clearanceof clearance of said bearing, means on the tubular v oneV to four times the clearance of the bearing, means' forming anV acceleration chamber adjacent the muzzle end of-said sleeve and `barrL-and vmeans in .said tubular Vmember establishing com- Amunicationbetween the atmospherefand accelerating chamber Yupon the recoil of the `barrel and intermediate said bearing and broachingrings.

jacent the muzzle'end of said sleeve and barrel, Y

said tubular member being formed to provide ports communicating. between the atmosphere and accelerating chamber upon the'recoil of the barrel and intermediate said bearing and broachl Y Y Ying rings,Y andY the, junction of thecylindrical body portion andforward reduced portion of said sleeve being Yso related to the ports that it vwill deilect gases flowing pastrsaid broaching, vrings into said ports.` A

5. A weapon comprising a recoilinglbarrel, said barrel being disposed' inY a liquidfcontainer having a front end cap formed to provide a bearing for the muzzle portion Vof the barrel,V a bearing `sealed VArelation,

sleeve provided .with a cylindrical Ibody portion f ,terminating in .a'forward portion' of reduced section secured to the muzzle Aend portionjof the 1 9.-The vstructure of claim 84 wherein said breaching rings are providcdwith confronting vannular' clearance grooves.

' 10. In aweaponcomprising arecoiling barrel,

aV barrel jacket surrounding the barrel, a `tubui lar member secured to the jacket in axial Vprolongationthereof, a` bearing sleeve. secured to the muzzle end portion of the barrel. in 'fluid said tubular` memberl being formed to receivethe sleeve in accurately fitted bearing relation rearwardly of the muzzle end thereof, a broaching ring secured to the forward portion ofsaid sleeve,a cooperating` broaching ringlofVv greater width than said fi'irst named breaching ring Vsecuredto the tub-ularmember in overlapping relation to either end VofV the latter i-nthe in battery? position Vofthe barreLqsaid broaching rings having a working clearance of j one to four times the clearanceof `the bearing," 'means on the tubular' member forming anacceleration chamber adjacent themuzzleend of intermediate said bearing and broachingrings.

f vbearing relatifoliV rearwardly thereof',` a breaching ring secure prtionpf said sleeve,` a cooperatingV vbroachirig 11, The structure of claim 10 wherein said Y rst recited bearing ring is' providedA withl aVV clearance groove and 'said breaching ring` of' V`V greater Width is provided with Ya'plt'iralityo'fjA spaced clearance grooves confrontingandzdis' vposed with an adjacent groove Wholly to either Y side of the groove in said 'rst recited breaching ring. y

Y. 12; In a muzzle end portion of the barrel in fluid Ysealed relation, Asaid'tubular memberrbeing formedfto receive the sleeve in accuratelyptted bearing -relation rearwardlypf thefmuzzle end thereof, complementary broaching rings secured to VVthe vbarrel sleeveadjacentrits' muzzle end and theV tubular member disposed toY haveadjacentV ends in spaced relation in the fin battery position oi the barrel; said broaching rings havingja Working clearance of one to four times the Vclearance' of the bearing, means onfthe tubular member j in saidftubular member establishing communi- '.Ication betweenV atmosphere andthel interior .thereof at points intermediate said bearing and broaching rings.

13. The structure of claim 12A wherein'- said bular membersecured to the jacket in axial pro` longation thereof, a bearing sleeve securedrto 's the muzzle end portion of the barrel lin uid t Y arecoiling har-Y rel, a barrel jacket surrounding thebarrel; a tuforming anacceleration` chamber adjacent the muzzle end of the-sleeve andV barrel, andmeans Y i' cent ltlfie'muzvzle endof,said sleeve andbarrel, i L andmeans in sfaidV tubular member VestablishingV .Y rcommunication Ybetween atmosphere andthe'in-i I 4o breaching ring on the bearing sleeve is secure`d thereonbyfmeans of'silveralloybrazing.` 45

sealed relation, said tubular member beingclearance ofsone to four `times the clearancegof; the bearing, Ymeans" fon y the tubularfmemberforming. an acceleration chamberVV adjacent the muzzle end ofi said'sleeveV and barrel, and meansv Vwirr-'said Vtulcfular member-* establishing communi z cation f between atmosphere and the i interior. Y j thereof at points intermediate saidbearing and" Weapon comprising a recoiling fb a rbreaching rings'r f v rel,=a barrel jacket surrounding thebarreL atuf l Y bular member secured tothe jacketein axial prof "broaching-rings are provided with similar conj Y Ylongation thereof, abearing sleeve secured tothe fl v Y v16v.1Ir '1 airweaponcomprising a recc` ilingl barfi;

' rel ,1' av barrel` jacket surroundingdthe barrel; a tu b ular member .ofJ non-:corrosive material -se`1fv Vchromium"alloy's,ecured tn the sleeveand tribu-" 'formed to' receive there' ringiofj-"greater "width thanj said Aiirstfnf'ilried broachingfring secured to the tubular-member;

jin overlapping'relation jto theY forvvardferid Vof Vthe latterinthe' in battery'positionzofrth'e barrel, said rbroachin'g rings l'iavngV a `Workingff.

fronting annular.' clearance grooves.- f

cured -to vthe .jacket'in axial prolongation therejsleeve'inr-accurately fitted `bearing re1ation;rear- VWardly fof; themu'zzleerrd.gtlfiereof',` cooperating? Y A Y broaching ringSl formedof a tungstenfcobalt-L lar,V member forwardly offsaidbearing and havf ing'a'working clearanceof one'to fourti'ms the clearancejof .thebea'ring means on thetubular memberforming an, acceleration chamber adja-VA l terior thereof-at pointsgintermediate said bear: ing andbroaching rings." a t 17; The structureof yclaim 16 :wherein said r ,crema-q; 

